Why should the therapist be concerned not to operate a small-volume nebulizer (SVN) at a flow greater than 10 L/min when administering a bronchodilator to a patient with asthma?
A. At flows greater than 10 L/min, the MMAD increases above 5 ?m.
B. Operating a SVN at flows greater than 10 L/min wastes a large amount of medication.
C. Using a flow of greater than 10 L/min would cause the pressure inside the SVN to increase, and create a hazard for the patient.
D. Delivering medication from a SVN with flows greater than 10 L/min is not a problem.
?ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Increasing flow to a nebulizer creates smaller particles, but shortens the duration of nebulization. At the same time, the increased flow produces the most medication waste because nebulization is continuous and occurs throughout the respiratory cycle.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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